Date: Wed, 5 Sep 2007 20:51:00 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Kris Kennaway <kris@FreeBSD.org> Cc: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, Mike Silbersack <silby@silby.com>, Alfred Perlstein <alfred@freebsd.org>, cvs-all@FreeBSD.org, Jeff Roberson <jroberson@chesapeake.net> Subject: Re: cvs commit: src/sys/conf NOTES files options src/sys/dev/acpica acpi_ec.c src/sys/kern kern_ktrace.c kern_rwlock.c kern_sx.c kern_thread.c subr_sleepqueue.c subr_turnstile.c src/sys/netinet6 in6_src.c src/sys/sys _rwlock.h _sx.h lock_profile.h proc.h ... Message-ID: <20070905205015.D42404@fledge.watson.org> In-Reply-To: <46DECB5B.9020801@FreeBSD.org> References: <200709042240.l84Mepmx031000@repoman.freebsd.org> <20070904175220.Q534@10.0.0.1> <20070905071752.GG87451@elvis.mu.org> <46DE6DAC.1010209@FreeBSD.org> <20070905094949.C42258@odysseus.silby.com> <46DECB5B.9020801@FreeBSD.org>
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On Wed, 5 Sep 2007, Kris Kennaway wrote: > Mike Silbersack wrote: >> >> On Wed, 5 Sep 2007, Kris Kennaway wrote: >> >>> Check my slides from the devsummit, at >>> >>> http://people.freebsd.org/~kris/scaling/Scalability%20Update.pdf >>> >>> Most of the improvement to mysql on 7.0 came from fixed sx locks and >>> converting filedesc to use them. >> >> I can't remember. Are filedesc locking improvements helpful to only >> threaded apps, or do non-threaded apps benefit as well? > > Threaded. They actually may also lower the overhead for non-threaded apps to perform some operations, but the difference won't be nearly as dramatic as for threaded applications that pound the file descriptor array heavily. Robert N M Watson Computer Laboratory University of Cambridge
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